Mongoceras

Mongoceras
Temporal range: 443.7–428.2 Ma
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Order: Orthocerida
Superfamily: Orthocerataceae
Genus: Mongoceras

Mongoceras is an extinct orthoconic nautiloid cephalopod found in the Silurian of China and Siberia.[1] It is included in the Orthocerida.[2] The family in undetermined.

Morphology

As with the Orthocerida the shell of Mongoceras is generally long and straight, with a generally central siphuncle composed of thin connecting rings. A vertical, heads down orientation in life can be inferred, in contrast with the horizontal benthic orientation of ellesmerocerida, endocerids, and many actinocerids with their weighted ventral siphuncles.[3]

Association

Mongoceras has been found with Kionoceras, Geisonocers, and Sichuanoceras in Silurian reefoid formations in China, along with a suite of other benthic invertebrates. It has also been found in core samples from Siberia with Edenoceras hiliferum and Geisonoceras kureikense.[3]

References

  1. ↑ PaleoBiology Database Mongocerasentry accessed 10 July 2012
  2. ↑ Sepkoski's list of Cephalopod genera
  3. 1 2 C. Teichert (1964). R.C. Moore, ed. Part K, Mollusca 3. Treatise on Invertebrate Paleontology. Lawrence, Kansas: Geological Society of America and University of Kansas Press. p. K190–K216.
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